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interface-ip: Fix broadcast address when using /31 or /32 IPv4 addressing
[project/netifd.git] / interface-ip.c
1 /*
2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
4 * Copyright (C) 2012 Steven Barth <steven@midlink.org>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <string.h>
16 #include <stdlib.h>
17 #include <stdio.h>
18
19 #include <limits.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #include "netifd.h"
24 #include "device.h"
25 #include "interface.h"
26 #include "interface-ip.h"
27 #include "proto.h"
28 #include "ubus.h"
29 #include "system.h"
30
31 enum {
32 ROUTE_INTERFACE,
33 ROUTE_TARGET,
34 ROUTE_MASK,
35 ROUTE_GATEWAY,
36 ROUTE_METRIC,
37 ROUTE_MTU,
38 ROUTE_VALID,
39 ROUTE_TABLE,
40 ROUTE_SOURCE,
41 ROUTE_ONLINK,
42 ROUTE_TYPE,
43 __ROUTE_MAX
44 };
45
46 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
47 [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
48 [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
49 [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
50 [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
51 [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
52 [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
53 [ROUTE_TABLE] = { .name = "table", .type = BLOBMSG_TYPE_STRING },
54 [ROUTE_VALID] = { .name = "valid", .type = BLOBMSG_TYPE_INT32 },
55 [ROUTE_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_STRING },
56 [ROUTE_ONLINK] = { .name = "onlink", .type = BLOBMSG_TYPE_BOOL },
57 [ROUTE_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING }
58 };
59
60 const struct uci_blob_param_list route_attr_list = {
61 .n_params = __ROUTE_MAX,
62 .params = route_attr,
63 };
64
65
66 struct list_head prefixes = LIST_HEAD_INIT(prefixes);
67 static struct device_prefix *ula_prefix = NULL;
68 static struct uloop_timeout valid_until_timeout;
69
70
71 static void
72 clear_if_addr(union if_addr *a, int mask)
73 {
74 int m_bytes = (mask + 7) / 8;
75 uint8_t m_clear = (1 << (m_bytes * 8 - mask)) - 1;
76 uint8_t *p = (uint8_t *) a;
77
78 if (m_bytes < sizeof(*a))
79 memset(p + m_bytes, 0, sizeof(*a) - m_bytes);
80
81 p[m_bytes - 1] &= ~m_clear;
82 }
83
84 static bool
85 match_if_addr(union if_addr *a1, union if_addr *a2, int mask)
86 {
87 union if_addr *p1, *p2;
88
89 p1 = alloca(sizeof(*a1));
90 p2 = alloca(sizeof(*a2));
91
92 memcpy(p1, a1, sizeof(*a1));
93 clear_if_addr(p1, mask);
94 memcpy(p2, a2, sizeof(*a2));
95 clear_if_addr(p2, mask);
96
97 return !memcmp(p1, p2, sizeof(*p1));
98 }
99
100 static int set_ip_source_policy(bool add, bool v6, unsigned int priority,
101 const union if_addr *addr, uint8_t mask, unsigned int table,
102 struct interface *in_iface, const char *action)
103 {
104 struct iprule rule = {
105 .flags = IPRULE_PRIORITY,
106 .priority = priority
107 };
108
109 if (addr) {
110 rule.flags |= IPRULE_SRC;
111 rule.src_addr = *addr;
112 rule.src_mask = mask;
113 }
114
115 if (table) {
116 rule.flags |= IPRULE_LOOKUP;
117 rule.lookup = table;
118
119 if (!rule.lookup)
120 return 0;
121 } else if (action) {
122 rule.flags |= IPRULE_ACTION;
123 system_resolve_iprule_action(action, &rule.action);
124 }
125
126 if (in_iface && in_iface->l3_dev.dev) {
127 rule.flags |= IPRULE_IN;
128 strcpy(rule.in_dev, in_iface->l3_dev.dev->ifname);
129 }
130
131 rule.flags |= (v6) ? IPRULE_INET6 : IPRULE_INET4;
132
133 return (add) ? system_add_iprule(&rule) : system_del_iprule(&rule);
134 }
135
136 static bool
137 __find_ip_addr_target(struct interface_ip_settings *ip, union if_addr *a, bool v6)
138 {
139 struct device_addr *addr;
140
141 vlist_for_each_element(&ip->addr, addr, node) {
142 if (!addr->enabled)
143 continue;
144
145 if (v6 != ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
146 continue;
147
148 // Handle offlink addresses correctly
149 unsigned int mask = addr->mask;
150 if ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET6 &&
151 (addr->flags & DEVADDR_OFFLINK))
152 mask = 128;
153
154 if (!match_if_addr(&addr->addr, a, mask))
155 continue;
156
157 return true;
158 }
159
160 return false;
161 }
162
163 static void
164 __find_ip_route_target(struct interface_ip_settings *ip, union if_addr *a,
165 bool v6, struct device_route **res)
166 {
167 struct device_route *route;
168
169 vlist_for_each_element(&ip->route, route, node) {
170 if (!route->enabled)
171 continue;
172
173 if (v6 != ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6))
174 continue;
175
176 if (!match_if_addr(&route->addr, a, route->mask))
177 continue;
178
179 if (route->flags & DEVROUTE_TABLE)
180 continue;
181
182 if (!*res || route->mask < (*res)->mask)
183 *res = route;
184 }
185 }
186
187 static bool
188 interface_ip_find_addr_target(struct interface *iface, union if_addr *a, bool v6)
189 {
190 return __find_ip_addr_target(&iface->proto_ip, a, v6) ||
191 __find_ip_addr_target(&iface->config_ip, a, v6);
192 }
193
194 static void
195 interface_ip_find_route_target(struct interface *iface, union if_addr *a,
196 bool v6, struct device_route **route)
197 {
198 __find_ip_route_target(&iface->proto_ip, a, v6, route);
199 __find_ip_route_target(&iface->config_ip, a, v6, route);
200 }
201
202 struct interface *
203 interface_ip_add_target_route(union if_addr *addr, bool v6, struct interface *iface)
204 {
205 struct device_route *route, *r_next = NULL;
206 bool defaultroute_target = false;
207 int addrsize = v6 ? sizeof(addr->in6) : sizeof(addr->in);
208
209 route = calloc(1, sizeof(*route));
210 if (!route)
211 return NULL;
212
213 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
214 route->mask = v6 ? 128 : 32;
215 if (memcmp(&route->addr, addr, addrsize) == 0)
216 defaultroute_target = true;
217 else
218 memcpy(&route->addr, addr, addrsize);
219
220 if (iface) {
221 /* look for locally addressable target first */
222 if (interface_ip_find_addr_target(iface, addr, v6))
223 goto done;
224
225 /* do not stop at the first route, let the lookup compare
226 * masks to find the best match */
227 interface_ip_find_route_target(iface, addr, v6, &r_next);
228 } else {
229 vlist_for_each_element(&interfaces, iface, node) {
230 /* look for locally addressable target first */
231 if (interface_ip_find_addr_target(iface, addr, v6))
232 goto done;
233
234 /* do not stop at the first route, let the lookup compare
235 * masks to find the best match */
236 interface_ip_find_route_target(iface, addr, v6, &r_next);
237 }
238 }
239
240 if (!r_next) {
241 free(route);
242 return NULL;
243 }
244
245 iface = r_next->iface;
246 memcpy(&route->nexthop, &r_next->nexthop, sizeof(route->nexthop));
247 route->mtu = r_next->mtu;
248 route->metric = r_next->metric;
249 route->table = r_next->table;
250
251 done:
252 route->iface = iface;
253 if (defaultroute_target)
254 free(route);
255 else
256 vlist_add(&iface->host_routes, &route->node, route);
257 return iface;
258 }
259
260 void
261 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
262 {
263 struct interface_ip_settings *ip;
264 struct blob_attr *tb[__ROUTE_MAX], *cur;
265 struct device_route *route;
266 int af = v6 ? AF_INET6 : AF_INET;
267 bool is_proto_route = !!iface;
268
269 blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
270
271 if (!iface) {
272 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
273 return;
274
275 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
276 if (!iface)
277 return;
278
279 ip = &iface->config_ip;
280 } else {
281 ip = &iface->proto_ip;
282 }
283
284 route = calloc(1, sizeof(*route));
285 if (!route)
286 return;
287
288 route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
289 route->mask = v6 ? 128 : 32;
290 if ((cur = tb[ROUTE_MASK]) != NULL) {
291 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
292 if (route->mask > (v6 ? 128 : 32))
293 goto error;
294 }
295
296 if ((cur = tb[ROUTE_TARGET]) != NULL) {
297 if (!parse_ip_and_netmask(af, blobmsg_data(cur), &route->addr, &route->mask)) {
298 DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
299 goto error;
300 }
301 }
302
303 if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
304 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
305 DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
306 goto error;
307 }
308 }
309
310 if ((cur = tb[ROUTE_METRIC]) != NULL) {
311 route->metric = blobmsg_get_u32(cur);
312 route->flags |= DEVROUTE_METRIC;
313 } else
314 route->metric = iface->metric;
315
316 if ((cur = tb[ROUTE_MTU]) != NULL) {
317 route->mtu = blobmsg_get_u32(cur);
318 route->flags |= DEVROUTE_MTU;
319 }
320
321 // Use source-based routing
322 if ((cur = tb[ROUTE_SOURCE]) != NULL) {
323 char *saveptr, *source = alloca(blobmsg_data_len(cur));
324 memcpy(source, blobmsg_data(cur), blobmsg_data_len(cur));
325
326 const char *addr = strtok_r(source, "/", &saveptr);
327 const char *mask = strtok_r(NULL, "/", &saveptr);
328
329 if (!addr || inet_pton(af, addr, &route->source) < 1) {
330 DPRINTF("Failed to parse route source: %s\n", addr);
331 goto error;
332 }
333
334 route->sourcemask = (mask) ? atoi(mask) : ((af == AF_INET6) ? 128 : 32);
335 }
336
337 if ((cur = tb[ROUTE_ONLINK]) != NULL && blobmsg_get_bool(cur))
338 route->flags |= DEVROUTE_ONLINK;
339
340 if (is_proto_route) {
341 route->table = (v6) ? iface->ip6table : iface->ip4table;
342 route->flags |= DEVROUTE_SRCTABLE;
343 }
344
345 if ((cur = tb[ROUTE_TABLE]) != NULL) {
346 if (!system_resolve_rt_table(blobmsg_data(cur), &route->table)) {
347 DPRINTF("Failed to resolve routing table: %s\n", (char *) blobmsg_data(cur));
348 goto error;
349 }
350
351 /* only set the table flag if not using the main (default) table */
352 if (system_is_default_rt_table(route->table))
353 route->table = 0;
354
355 if (route->table)
356 route->flags |= DEVROUTE_TABLE;
357 }
358
359 if ((cur = tb[ROUTE_VALID]) != NULL) {
360 int64_t valid = blobmsg_get_u32(cur);
361 int64_t valid_until = valid + (int64_t)system_get_rtime();
362 if (valid_until <= LONG_MAX && valid != 0xffffffffLL) // Catch overflow
363 route->valid_until = valid_until;
364 }
365
366 if ((cur = tb[ROUTE_TYPE]) != NULL) {
367 if (!system_resolve_rt_type(blobmsg_data(cur), &route->type)) {
368 DPRINTF("Failed to resolve routing type: %s\n", (char *) blobmsg_data(cur));
369 goto error;
370 }
371 route->flags |= DEVROUTE_TYPE;
372 }
373
374 vlist_add(&ip->route, &route->node, route);
375 return;
376
377 error:
378 free(route);
379 }
380
381 static int
382 addr_cmp(const void *k1, const void *k2, void *ptr)
383 {
384 return memcmp(k1, k2, sizeof(struct device_addr) -
385 offsetof(struct device_addr, flags));
386 }
387
388 static int
389 route_cmp(const void *k1, const void *k2, void *ptr)
390 {
391 const struct device_route *r1 = k1, *r2 = k2;
392
393 if (r1->mask != r2->mask)
394 return r2->mask - r1->mask;
395
396 if (r1->metric != r2->metric)
397 return r1->metric - r2->metric;
398
399 if (r1->flags != r2->flags)
400 return r2->flags - r1->flags;
401
402 if (r1->sourcemask != r2->sourcemask)
403 return r1->sourcemask - r2->sourcemask;
404
405 if (r1->table != r2->table)
406 return r1->table - r2->table;
407
408 int maskcmp = memcmp(&r1->source, &r2->source, sizeof(r1->source));
409 if (maskcmp)
410 return maskcmp;
411
412 return memcmp(&r1->addr, &r2->addr, sizeof(r1->addr));
413 }
414
415 static int
416 prefix_cmp(const void *k1, const void *k2, void *ptr)
417 {
418 return memcmp(k1, k2, offsetof(struct device_prefix, pclass) -
419 offsetof(struct device_prefix, addr));
420 }
421
422 static void
423 interface_handle_subnet_route(struct interface *iface, struct device_addr *addr, bool add)
424 {
425 struct device *dev = iface->l3_dev.dev;
426 struct device_route route;
427
428 if (addr->flags & DEVADDR_OFFLINK)
429 return;
430
431 memset(&route, 0, sizeof(route));
432 route.iface = iface;
433 route.flags = addr->flags;
434 route.mask = addr->mask;
435 memcpy(&route.addr, &addr->addr, sizeof(route.addr));
436 clear_if_addr(&route.addr, route.mask);
437
438 if (add) {
439 route.flags |= DEVADDR_KERNEL;
440 system_del_route(dev, &route);
441
442 route.flags &= ~DEVADDR_KERNEL;
443 route.metric = iface->metric;
444 system_add_route(dev, &route);
445 } else {
446 system_del_route(dev, &route);
447 }
448 }
449
450 static void
451 interface_update_proto_addr(struct vlist_tree *tree,
452 struct vlist_node *node_new,
453 struct vlist_node *node_old)
454 {
455 struct interface_ip_settings *ip;
456 struct interface *iface;
457 struct device *dev;
458 struct device_addr *a_new = NULL, *a_old = NULL;
459 bool replace = false;
460 bool keep = false;
461 bool v6 = false;
462
463 ip = container_of(tree, struct interface_ip_settings, addr);
464 iface = ip->iface;
465 dev = iface->l3_dev.dev;
466
467 if (!node_new || !node_old)
468 iface->updated |= IUF_ADDRESS;
469
470 if (node_new) {
471 a_new = container_of(node_new, struct device_addr, node);
472
473 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
474 !a_new->broadcast) {
475
476 /* /31 and /32 addressing need 255.255.255.255
477 * as broadcast address. */
478 if (a_new->mask >= 31) {
479 a_new->broadcast = (uint32_t) ~0;
480 } else {
481 uint32_t mask = ~0;
482 uint32_t *a = (uint32_t *) &a_new->addr;
483
484 mask >>= a_new->mask;
485 a_new->broadcast = *a | htonl(mask);
486 }
487 }
488 }
489
490 if (node_old)
491 a_old = container_of(node_old, struct device_addr, node);
492
493 if (a_new && a_old) {
494 keep = true;
495
496 if (a_old->flags != a_new->flags || a_old->failed)
497 keep = false;
498
499 if (a_old->valid_until != a_new->valid_until ||
500 a_old->preferred_until != a_new->preferred_until)
501 replace = true;
502
503 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
504 a_new->broadcast != a_old->broadcast)
505 keep = false;
506 }
507
508 if (node_old) {
509 if (a_old->enabled && !keep) {
510 if ((a_old->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
511 v6 = true;
512
513 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
514
515 //This is needed for source routing to work correctly. If a device
516 //has two connections to a network using the same subnet, adding
517 //only the network-rule will cause packets to be routed through the
518 //first matching network (source IP matches both masks).
519 if (table) {
520 set_ip_source_policy(false, v6, IPRULE_PRIORITY_ADDR, &a_old->addr,
521 (v6) ? 128 : 32, table, NULL, NULL);
522
523 if (a_old->mask != ((v6) ? 128 : 32))
524 set_ip_source_policy(false, v6, IPRULE_PRIORITY_NW, &a_old->addr,
525 a_old->mask, table, NULL, NULL);
526 }
527
528 if (!(a_old->flags & DEVADDR_EXTERNAL)) {
529 interface_handle_subnet_route(iface, a_old, false);
530 system_del_address(dev, a_old);
531 }
532 }
533 free(a_old->pclass);
534 free(a_old);
535 }
536
537 if (node_new) {
538 a_new->enabled = true;
539 if (!keep || replace) {
540 if (!(a_new->flags & DEVADDR_EXTERNAL)) {
541 if (system_add_address(dev, a_new))
542 a_new->failed = true;
543
544 if (iface->metric)
545 interface_handle_subnet_route(iface, a_new, true);
546 }
547
548 if (!keep) {
549 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET6)
550 v6 = true;
551
552 unsigned int table = (v6) ? iface->ip6table : iface->ip4table;
553
554 if (table) {
555 set_ip_source_policy(true, v6, IPRULE_PRIORITY_ADDR, &a_new->addr,
556 (v6) ? 128 : 32, table, NULL, NULL);
557
558 if (a_new->mask != ((v6) ? 128 : 32))
559 set_ip_source_policy(true, v6, IPRULE_PRIORITY_NW, &a_new->addr,
560 a_new->mask, table, NULL, NULL);
561 }
562 }
563 }
564 }
565 }
566
567 static bool
568 enable_route(struct interface_ip_settings *ip, struct device_route *route)
569 {
570 if (ip->no_defaultroute && !route->mask)
571 return false;
572
573 return ip->enabled;
574 }
575
576 static void
577 interface_update_proto_route(struct vlist_tree *tree,
578 struct vlist_node *node_new,
579 struct vlist_node *node_old)
580 {
581 struct interface_ip_settings *ip;
582 struct interface *iface;
583 struct device *dev;
584 struct device_route *route_old, *route_new;
585 bool keep = false;
586
587 ip = container_of(tree, struct interface_ip_settings, route);
588 iface = ip->iface;
589 dev = iface->l3_dev.dev;
590
591 if (!node_new || !node_old)
592 iface->updated |= IUF_ROUTE;
593
594 route_old = container_of(node_old, struct device_route, node);
595 route_new = container_of(node_new, struct device_route, node);
596
597 if (node_old && node_new)
598 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop)) &&
599 (route_old->mtu == route_new->mtu) && (route_old->type == route_new->type) &&
600 !route_old->failed;
601
602 if (node_old) {
603 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
604 system_del_route(dev, route_old);
605
606 free(route_old);
607 }
608
609 if (node_new) {
610 bool _enabled = enable_route(ip, route_new);
611
612 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
613 if (system_add_route(dev, route_new))
614 route_new->failed = true;
615
616 route_new->iface = iface;
617 route_new->enabled = _enabled;
618 }
619 }
620
621 static void
622 interface_update_host_route(struct vlist_tree *tree,
623 struct vlist_node *node_new,
624 struct vlist_node *node_old)
625 {
626 struct interface *iface;
627 struct device *dev;
628 struct device_route *route_old, *route_new;
629
630 iface = container_of(tree, struct interface, host_routes);
631 dev = iface->l3_dev.dev;
632
633 route_old = container_of(node_old, struct device_route, node);
634 route_new = container_of(node_new, struct device_route, node);
635
636 if (node_old) {
637 system_del_route(dev, route_old);
638 free(route_old);
639 }
640
641 if (node_new) {
642 if (system_add_route(dev, route_new))
643 route_new->failed = true;
644 }
645 }
646
647 static void
648 random_ifaceid(struct in6_addr *addr)
649 {
650 static bool initialized = false;
651 struct timeval t;
652
653 if (!initialized) {
654 long int seed = 0;
655 gettimeofday(&t, NULL);
656 seed = t.tv_sec ^ t.tv_usec ^ getpid();
657 srand48(seed);
658 initialized = true;
659 }
660 addr->s6_addr32[2] = (uint32_t)mrand48();
661 addr->s6_addr32[3] = (uint32_t)mrand48();
662 }
663
664 static void
665 eui64_ifaceid(struct interface *iface, struct in6_addr *addr)
666 {
667 /* get mac address */
668 uint8_t *macaddr = iface->l3_dev.dev->settings.macaddr;
669 uint8_t *ifaceid = addr->s6_addr + 8;
670 memcpy(ifaceid,macaddr,3);
671 memcpy(ifaceid + 5,macaddr + 3, 3);
672 ifaceid[3] = 0xff;
673 ifaceid[4] = 0xfe;
674 ifaceid[0] ^= 0x02;
675 }
676
677 static void
678 generate_ifaceid(struct interface *iface, struct in6_addr *addr)
679 {
680 /* generate new iface id */
681 switch (iface->assignment_iface_id_selection) {
682 case IFID_FIXED:
683 /* fixed */
684 /* copy host part from assignment_fixed_iface_id */
685 memcpy(addr->s6_addr + 8, iface->assignment_fixed_iface_id.s6_addr + 8, 8);
686 break;
687 case IFID_RANDOM:
688 /* randomize last 64 bits */
689 random_ifaceid(addr);
690 break;
691 case IFID_EUI64:
692 /* eui64 */
693 eui64_ifaceid(iface, addr);
694 break;
695 }
696 }
697
698 static void
699 interface_set_prefix_address(struct device_prefix_assignment *assignment,
700 const struct device_prefix *prefix, struct interface *iface, bool add)
701 {
702 const struct interface *uplink = prefix->iface;
703 if (!iface->l3_dev.dev)
704 return;
705
706 struct device *l3_downlink = iface->l3_dev.dev;
707
708 struct device_addr addr;
709 struct device_route route;
710 memset(&addr, 0, sizeof(addr));
711 memset(&route, 0, sizeof(route));
712
713 if (IN6_IS_ADDR_UNSPECIFIED(&assignment->addr)) {
714 addr.addr.in6 = prefix->addr;
715 addr.addr.in6.s6_addr32[1] |= htonl(assignment->assigned);
716 generate_ifaceid(iface, &addr.addr.in6);
717 assignment->addr = addr.addr.in6;
718 }
719 else
720 addr.addr.in6 = assignment->addr;
721
722 addr.mask = assignment->length;
723 addr.flags = DEVADDR_INET6 | DEVADDR_OFFLINK;
724 addr.preferred_until = prefix->preferred_until;
725 addr.valid_until = prefix->valid_until;
726
727 route.flags = DEVADDR_INET6;
728 route.mask = addr.mask < 64 ? 64 : addr.mask;
729 route.addr = addr.addr;
730 clear_if_addr(&route.addr, route.mask);
731
732 if (!add && assignment->enabled) {
733 time_t now = system_get_rtime();
734 addr.preferred_until = now;
735 if (!addr.valid_until || addr.valid_until - now > 7200)
736 addr.valid_until = now + 7200;
737
738 if (prefix->iface) {
739 if (prefix->iface->ip6table)
740 set_ip_source_policy(false, true, IPRULE_PRIORITY_NW, &addr.addr,
741 addr.mask, prefix->iface->ip6table, iface, NULL);
742
743 set_ip_source_policy(false, true, IPRULE_PRIORITY_REJECT, &addr.addr,
744 addr.mask, 0, iface, "unreachable");
745 }
746
747 system_del_route(l3_downlink, &route);
748 system_add_address(l3_downlink, &addr);
749
750 assignment->enabled = false;
751 } else if (add && (iface->state == IFS_UP || iface->state == IFS_SETUP) &&
752 !system_add_address(l3_downlink, &addr)) {
753
754 if (prefix->iface && !assignment->enabled) {
755 set_ip_source_policy(true, true, IPRULE_PRIORITY_REJECT, &addr.addr,
756 addr.mask, 0, iface, "unreachable");
757
758 if (prefix->iface->ip6table)
759 set_ip_source_policy(true, true, IPRULE_PRIORITY_NW, &addr.addr,
760 addr.mask, prefix->iface->ip6table, iface, NULL);
761 }
762
763 route.metric = iface->metric;
764 system_add_route(l3_downlink, &route);
765
766 if (uplink && uplink->l3_dev.dev && !(l3_downlink->settings.flags & DEV_OPT_MTU6)) {
767 int mtu = system_update_ipv6_mtu(uplink->l3_dev.dev, 0);
768 int mtu_old = system_update_ipv6_mtu(l3_downlink, 0);
769
770 if (mtu > 0 && mtu_old > mtu)
771 system_update_ipv6_mtu(l3_downlink, mtu);
772 }
773
774 assignment->enabled = true;
775 }
776 }
777
778 static bool interface_prefix_assign(struct list_head *list,
779 struct device_prefix_assignment *assign)
780 {
781 int32_t current = 0, asize = (1 << (64 - assign->length)) - 1;
782 struct device_prefix_assignment *c;
783 list_for_each_entry(c, list, head) {
784 if (assign->assigned != -1) {
785 if (assign->assigned >= current && assign->assigned + asize < c->assigned) {
786 list_add_tail(&assign->head, &c->head);
787 return true;
788 }
789 } else if (assign->assigned == -1) {
790 current = (current + asize) & (~asize);
791 if (current + asize < c->assigned) {
792 assign->assigned = current;
793 list_add_tail(&assign->head, &c->head);
794 return true;
795 }
796 }
797 current = (c->assigned + (1 << (64 - c->length)));
798 }
799 return false;
800 }
801
802 static void interface_update_prefix_assignments(struct device_prefix *prefix, bool setup)
803 {
804 struct device_prefix_assignment *c;
805 struct interface *iface;
806
807 // Delete all assignments
808 while (!list_empty(&prefix->assignments)) {
809 c = list_first_entry(&prefix->assignments,
810 struct device_prefix_assignment, head);
811 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
812 interface_set_prefix_address(c, prefix, iface, false);
813 list_del(&c->head);
814 free(c);
815 }
816
817 if (!setup)
818 return;
819
820 // End-of-assignment sentinel
821 c = malloc(sizeof(*c) + 1);
822 c->assigned = 1 << (64 - prefix->length);
823 c->length = 64;
824 c->name[0] = 0;
825 c->addr = in6addr_any;
826 list_add(&c->head, &prefix->assignments);
827
828 // Excluded prefix
829 if (prefix->excl_length > 0) {
830 const char name[] = "!excluded";
831 c = malloc(sizeof(*c) + sizeof(name));
832 c->assigned = ntohl(prefix->excl_addr.s6_addr32[1]) &
833 ((1 << (64 - prefix->length)) - 1);
834 c->length = prefix->excl_length;
835 c->addr = in6addr_any;
836 memcpy(c->name, name, sizeof(name));
837 list_add(&c->head, &prefix->assignments);
838 }
839
840 bool assigned_any = false;
841 struct list_head assign_later = LIST_HEAD_INIT(assign_later);
842 vlist_for_each_element(&interfaces, iface, node) {
843 if (iface->assignment_length < 48 ||
844 iface->assignment_length > 64)
845 continue;
846
847 // Test whether there is a matching class
848 if (!list_empty(&iface->assignment_classes)) {
849 bool found = false;
850
851 struct interface_assignment_class *c;
852 list_for_each_entry(c, &iface->assignment_classes, head) {
853 if (!strcmp(c->name, prefix->pclass)) {
854 found = true;
855 break;
856 }
857 }
858
859 if (!found)
860 continue;
861 }
862
863 size_t namelen = strlen(iface->name) + 1;
864 c = malloc(sizeof(*c) + namelen);
865 c->length = iface->assignment_length;
866 c->assigned = iface->assignment_hint;
867 c->addr = in6addr_any;
868 c->enabled = false;
869 memcpy(c->name, iface->name, namelen);
870
871 // First process all custom assignments, put all others in later-list
872 if (c->assigned == -1 || !interface_prefix_assign(&prefix->assignments, c)) {
873 if (c->assigned != -1) {
874 c->assigned = -1;
875 netifd_log_message(L_WARNING, "Failed to assign requested subprefix "
876 "of size %hhu for %s, trying other\n", c->length, c->name);
877 }
878
879 struct list_head *next = &assign_later;
880 struct device_prefix_assignment *n;
881 list_for_each_entry(n, &assign_later, head) {
882 if (n->length < c->length) {
883 next = &n->head;
884 break;
885 }
886 }
887 list_add_tail(&c->head, next);
888 }
889
890 if (c->assigned != -1)
891 assigned_any = true;
892 }
893
894 // Then try to assign all other + failed custom assignments
895 while (!list_empty(&assign_later)) {
896 c = list_first_entry(&assign_later, struct device_prefix_assignment, head);
897 list_del(&c->head);
898
899 bool assigned = false;
900 do {
901 assigned = interface_prefix_assign(&prefix->assignments, c);
902 } while (!assigned && ++c->length <= 64);
903
904 if (!assigned) {
905 netifd_log_message(L_WARNING, "Failed to assign subprefix "
906 "of size %hhu for %s\n", c->length, c->name);
907 free(c);
908 } else {
909 assigned_any = true;
910 }
911 }
912
913 list_for_each_entry(c, &prefix->assignments, head)
914 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
915 interface_set_prefix_address(c, prefix, iface, true);
916
917 if (!assigned_any)
918 netifd_log_message(L_WARNING, "You have delegated IPv6-prefixes but haven't assigned them "
919 "to any interface. Did you forget to set option ip6assign on your lan-interfaces?");
920 }
921
922
923 void interface_refresh_assignments(bool hint)
924 {
925 static bool refresh = false;
926 if (!hint && refresh) {
927 struct device_prefix *p;
928 list_for_each_entry(p, &prefixes, head)
929 interface_update_prefix_assignments(p, true);
930 }
931 refresh = hint;
932 }
933
934
935 static void
936 interface_update_prefix(struct vlist_tree *tree,
937 struct vlist_node *node_new,
938 struct vlist_node *node_old)
939 {
940 struct device_prefix *prefix_old, *prefix_new;
941 prefix_old = container_of(node_old, struct device_prefix, node);
942 prefix_new = container_of(node_new, struct device_prefix, node);
943
944 struct interface_ip_settings *ip = container_of(tree, struct interface_ip_settings, prefix);
945 if (tree && (!node_new || !node_old))
946 ip->iface->updated |= IUF_PREFIX;
947
948 struct device_route route;
949 memset(&route, 0, sizeof(route));
950 route.flags = DEVADDR_INET6;
951 route.metric = INT32_MAX;
952 route.mask = (node_new) ? prefix_new->length : prefix_old->length;
953 route.addr.in6 = (node_new) ? prefix_new->addr : prefix_old->addr;
954
955
956 struct device_prefix_assignment *c;
957 struct interface *iface;
958
959 if (node_old && node_new) {
960 // Move assignments and refresh addresses to update valid times
961 list_splice(&prefix_old->assignments, &prefix_new->assignments);
962
963 list_for_each_entry(c, &prefix_new->assignments, head)
964 if ((iface = vlist_find(&interfaces, c->name, iface, node)))
965 interface_set_prefix_address(c, prefix_new, iface, true);
966 } else if (node_new) {
967 // Set null-route to avoid routing loops
968 system_add_route(NULL, &route);
969
970 if (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation)
971 interface_update_prefix_assignments(prefix_new, true);
972 } else if (node_old) {
973 // Remove null-route
974 interface_update_prefix_assignments(prefix_old, false);
975 system_del_route(NULL, &route);
976 }
977
978 if (node_old) {
979 if (prefix_old->head.next)
980 list_del(&prefix_old->head);
981 free(prefix_old);
982 }
983
984 if (node_new && (!prefix_new->iface || !prefix_new->iface->proto_ip.no_delegation))
985 list_add(&prefix_new->head, &prefixes);
986
987 }
988
989 struct device_prefix*
990 interface_ip_add_device_prefix(struct interface *iface, struct in6_addr *addr,
991 uint8_t length, time_t valid_until, time_t preferred_until,
992 struct in6_addr *excl_addr, uint8_t excl_length, const char *pclass)
993 {
994 if (!pclass)
995 pclass = (iface) ? iface->name : "local";
996
997 struct device_prefix *prefix = calloc(1, sizeof(*prefix) + strlen(pclass) + 1);
998 prefix->length = length;
999 prefix->addr = *addr;
1000 prefix->preferred_until = preferred_until;
1001 prefix->valid_until = valid_until;
1002 prefix->iface = iface;
1003 INIT_LIST_HEAD(&prefix->assignments);
1004
1005 if (excl_addr) {
1006 prefix->excl_addr = *excl_addr;
1007 prefix->excl_length = excl_length;
1008 }
1009
1010 strcpy(prefix->pclass, pclass);
1011
1012 if (iface)
1013 vlist_add(&iface->proto_ip.prefix, &prefix->node, &prefix->addr);
1014 else
1015 interface_update_prefix(NULL, &prefix->node, NULL);
1016
1017 return prefix;
1018 }
1019
1020 void
1021 interface_ip_set_ula_prefix(const char *prefix)
1022 {
1023 char buf[INET6_ADDRSTRLEN + 4] = {0}, *saveptr;
1024 if (prefix)
1025 strncpy(buf, prefix, sizeof(buf) - 1);
1026 char *prefixaddr = strtok_r(buf, "/", &saveptr);
1027
1028 struct in6_addr addr;
1029 if (!prefixaddr || inet_pton(AF_INET6, prefixaddr, &addr) < 1) {
1030 if (ula_prefix) {
1031 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1032 ula_prefix = NULL;
1033 }
1034 return;
1035 }
1036
1037 int length;
1038 char *prefixlen = strtok_r(NULL, ",", &saveptr);
1039 if (!prefixlen || (length = atoi(prefixlen)) < 1 || length > 64)
1040 return;
1041
1042 if (!ula_prefix || !IN6_ARE_ADDR_EQUAL(&addr, &ula_prefix->addr) ||
1043 ula_prefix->length != length) {
1044 if (ula_prefix)
1045 interface_update_prefix(NULL, NULL, &ula_prefix->node);
1046
1047 ula_prefix = interface_ip_add_device_prefix(NULL, &addr, length,
1048 0, 0, NULL, 0, NULL);
1049 }
1050 }
1051
1052 void
1053 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
1054 {
1055 struct dns_server *s;
1056
1057 s = calloc(1, sizeof(*s));
1058 if (!s)
1059 return;
1060
1061 s->af = AF_INET;
1062 if (inet_pton(s->af, str, &s->addr.in))
1063 goto add;
1064
1065 s->af = AF_INET6;
1066 if (inet_pton(s->af, str, &s->addr.in))
1067 goto add;
1068
1069 free(s);
1070 return;
1071
1072 add:
1073 D(INTERFACE, "Add IPv%c DNS server: %s\n",
1074 s->af == AF_INET6 ? '6' : '4', str);
1075 vlist_simple_add(&ip->dns_servers, &s->node);
1076 }
1077
1078 void
1079 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
1080 {
1081 struct blob_attr *cur;
1082 int rem;
1083
1084 blobmsg_for_each_attr(cur, list, rem) {
1085 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1086 continue;
1087
1088 if (!blobmsg_check_attr(cur, NULL))
1089 continue;
1090
1091 interface_add_dns_server(ip, blobmsg_data(cur));
1092 }
1093 }
1094
1095 static void
1096 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
1097 {
1098 struct dns_search_domain *s;
1099 int len = strlen(str);
1100
1101 s = calloc(1, sizeof(*s) + len + 1);
1102 if (!s)
1103 return;
1104
1105 D(INTERFACE, "Add DNS search domain: %s\n", str);
1106 memcpy(s->name, str, len);
1107 vlist_simple_add(&ip->dns_search, &s->node);
1108 }
1109
1110 void
1111 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
1112 {
1113 struct blob_attr *cur;
1114 int rem;
1115
1116 blobmsg_for_each_attr(cur, list, rem) {
1117 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1118 continue;
1119
1120 if (!blobmsg_check_attr(cur, NULL))
1121 continue;
1122
1123 interface_add_dns_search_domain(ip, blobmsg_data(cur));
1124 }
1125 }
1126
1127 static void
1128 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip, const char *dev)
1129 {
1130 struct dns_server *s;
1131 struct dns_search_domain *d;
1132 const char *str;
1133 char buf[INET6_ADDRSTRLEN];
1134
1135 vlist_simple_for_each_element(&ip->dns_servers, s, node) {
1136 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
1137 if (!str)
1138 continue;
1139
1140 if (s->af == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&s->addr.in6))
1141 fprintf(f, "nameserver %s%%%s\n", str, dev);
1142 else
1143 fprintf(f, "nameserver %s\n", str);
1144 }
1145
1146 vlist_simple_for_each_element(&ip->dns_search, d, node) {
1147 fprintf(f, "search %s\n", d->name);
1148 }
1149 }
1150
1151 void
1152 interface_write_resolv_conf(void)
1153 {
1154 struct interface *iface;
1155 char *path = alloca(strlen(resolv_conf) + 5);
1156 FILE *f;
1157 uint32_t crcold, crcnew;
1158
1159 sprintf(path, "%s.tmp", resolv_conf);
1160 unlink(path);
1161 f = fopen(path, "w+");
1162 if (!f) {
1163 D(INTERFACE, "Failed to open %s for writing\n", path);
1164 return;
1165 }
1166
1167 vlist_for_each_element(&interfaces, iface, node) {
1168 if (iface->state != IFS_UP)
1169 continue;
1170
1171 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
1172 vlist_simple_empty(&iface->proto_ip.dns_servers) &&
1173 vlist_simple_empty(&iface->config_ip.dns_search) &&
1174 vlist_simple_empty(&iface->config_ip.dns_servers))
1175 continue;
1176
1177 fprintf(f, "# Interface %s\n", iface->name);
1178 write_resolv_conf_entries(f, &iface->config_ip, iface->ifname);
1179 if (!iface->proto_ip.no_dns)
1180 write_resolv_conf_entries(f, &iface->proto_ip, iface->ifname);
1181 }
1182 fflush(f);
1183 rewind(f);
1184 crcnew = crc32_file(f);
1185 fclose(f);
1186
1187 crcold = crcnew + 1;
1188 f = fopen(resolv_conf, "r");
1189 if (f) {
1190 crcold = crc32_file(f);
1191 fclose(f);
1192 }
1193
1194 if (crcold == crcnew) {
1195 unlink(path);
1196 } else if (rename(path, resolv_conf) < 0) {
1197 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
1198 unlink(path);
1199 }
1200 }
1201
1202 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
1203 {
1204 struct device_addr *addr;
1205 struct device_route *route;
1206 struct device *dev;
1207 struct interface *iface;
1208
1209 ip->enabled = enabled;
1210 iface = ip->iface;
1211 dev = iface->l3_dev.dev;
1212 if (!dev)
1213 return;
1214
1215 vlist_for_each_element(&ip->addr, addr, node) {
1216 if (addr->enabled == enabled)
1217 continue;
1218
1219 if (enabled) {
1220 system_add_address(dev, addr);
1221 if (iface->metric)
1222 interface_handle_subnet_route(iface, addr, true);
1223 } else {
1224 interface_handle_subnet_route(iface, addr, false);
1225 system_del_address(dev, addr);
1226 }
1227 addr->enabled = enabled;
1228 }
1229
1230 vlist_for_each_element(&ip->route, route, node) {
1231 bool _enabled = enabled;
1232
1233 if (!enable_route(ip, route))
1234 _enabled = false;
1235
1236 if (route->enabled == _enabled)
1237 continue;
1238
1239 if (_enabled) {
1240 if (!(route->flags & DEVROUTE_METRIC))
1241 route->metric = ip->iface->metric;
1242
1243 if (!(route->flags & DEVROUTE_TABLE)) {
1244 route->flags &= ~DEVROUTE_SRCTABLE;
1245 route->table = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET6) ?
1246 iface->ip6table : iface->ip4table;
1247
1248 if (route->table)
1249 route->flags |= DEVROUTE_SRCTABLE;
1250 }
1251
1252 if (system_add_route(dev, route))
1253 route->failed = true;
1254 } else
1255 system_del_route(dev, route);
1256 route->enabled = _enabled;
1257 }
1258
1259 struct device_prefix *c;
1260 struct device_prefix_assignment *a;
1261 list_for_each_entry(c, &prefixes, head)
1262 list_for_each_entry(a, &c->assignments, head)
1263 if (!strcmp(a->name, ip->iface->name))
1264 interface_set_prefix_address(a, c, ip->iface, enabled);
1265
1266 if (ip->iface && ip->iface->l3_dev.dev)
1267 set_ip_source_policy(enabled, true, IPRULE_PRIORITY_REJECT + ip->iface->l3_dev.dev->ifindex,
1268 NULL, 0, 0, ip->iface, "failed_policy");
1269 }
1270
1271 void
1272 interface_ip_update_start(struct interface_ip_settings *ip)
1273 {
1274 if (ip != &ip->iface->config_ip) {
1275 vlist_simple_update(&ip->dns_servers);
1276 vlist_simple_update(&ip->dns_search);
1277 }
1278 vlist_update(&ip->route);
1279 vlist_update(&ip->addr);
1280 vlist_update(&ip->prefix);
1281 }
1282
1283 void
1284 interface_ip_update_complete(struct interface_ip_settings *ip)
1285 {
1286 vlist_simple_flush(&ip->dns_servers);
1287 vlist_simple_flush(&ip->dns_search);
1288 vlist_flush(&ip->route);
1289 vlist_flush(&ip->addr);
1290 vlist_flush(&ip->prefix);
1291 interface_write_resolv_conf();
1292 }
1293
1294 void
1295 interface_ip_flush(struct interface_ip_settings *ip)
1296 {
1297 if (ip == &ip->iface->proto_ip)
1298 vlist_flush_all(&ip->iface->host_routes);
1299 vlist_simple_flush_all(&ip->dns_servers);
1300 vlist_simple_flush_all(&ip->dns_search);
1301 vlist_flush_all(&ip->route);
1302 vlist_flush_all(&ip->addr);
1303 vlist_flush_all(&ip->prefix);
1304 }
1305
1306 static void
1307 __interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
1308 {
1309 ip->iface = iface;
1310 ip->enabled = true;
1311 vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
1312 vlist_simple_init(&ip->dns_servers, struct dns_server, node);
1313 vlist_init(&ip->route, route_cmp, interface_update_proto_route);
1314 vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
1315 vlist_init(&ip->prefix, prefix_cmp, interface_update_prefix);
1316 }
1317
1318 void
1319 interface_ip_init(struct interface *iface)
1320 {
1321 __interface_ip_init(&iface->proto_ip, iface);
1322 __interface_ip_init(&iface->config_ip, iface);
1323 vlist_init(&iface->host_routes, route_cmp, interface_update_host_route);
1324 }
1325
1326 static void
1327 interface_ip_valid_until_handler(struct uloop_timeout *t)
1328 {
1329 time_t now = system_get_rtime();
1330 struct interface *iface;
1331 vlist_for_each_element(&interfaces, iface, node) {
1332 if (iface->state != IFS_UP)
1333 continue;
1334
1335 struct device_addr *addr, *addrp;
1336 struct device_route *route, *routep;
1337 struct device_prefix *pref, *prefp;
1338
1339 vlist_for_each_element_safe(&iface->proto_ip.addr, addr, node, addrp)
1340 if (addr->valid_until && addr->valid_until < now)
1341 vlist_delete(&iface->proto_ip.addr, &addr->node);
1342
1343 vlist_for_each_element_safe(&iface->proto_ip.route, route, node, routep)
1344 if (route->valid_until && route->valid_until < now)
1345 vlist_delete(&iface->proto_ip.route, &route->node);
1346
1347 vlist_for_each_element_safe(&iface->proto_ip.prefix, pref, node, prefp)
1348 if (pref->valid_until && pref->valid_until < now)
1349 vlist_delete(&iface->proto_ip.prefix, &pref->node);
1350
1351 }
1352
1353 uloop_timeout_set(t, 1000);
1354 }
1355
1356 static void __init
1357 interface_ip_init_worker(void)
1358 {
1359 valid_until_timeout.cb = interface_ip_valid_until_handler;
1360 uloop_timeout_set(&valid_until_timeout, 1000);
1361 }
OpenWrt Network interface configuration daemon